DE3324091A1 - Absorption compositions for the removal of mercury - Google Patents

Abstract

The present invention relates to absorption compositions for the removal of mercury present in a gas or liquid, and to a process for preparing them. The absorption compositions are characterised in that they consist of sulphur and a binder which is selected from alumina, silica, silica/alumina or cements, the total pore volume of the composition being 0.10 cm<3>/g or more, its specific surface area being between 10 and 250 m<2>/g and the quantity by weight of sulphur, relative to the binder, being 1 to 90%.

Description

Description :

The present invention relates to absorption masses for removing that which is present in a gas or a liquid Mercury and the process for their manufacture. .

Natural gas has different levels of mercury depending on its origin. These levels are generally in the order of 0.1 to 50 micrograms of mercury per m of gas. Due to the toxicity of the mercury and the ensuing risk of pollution it turns out to be necessary to the mercury to remove traces of mercury from these natural gases and generally from the numerous atmospheres may contain.

Numerous absorption masses have been proposed for removing mercury. So describes the French Patent application P 23 1o 795 a method for removing mercury from a gas or a liquid by means of a solid absorption mass that

a) a solid support selected from the group formed by silica, alumina, silica-alumina, silicates, aluminates and silicoaluminates, and
b) contains at least one metal suitable for forming an alloy with the mercury, and a special

2 has a specific surface area of at least 4o m / g, whereby the metal in the bulk exclusively in the form of crystallites with a mean diameter below 400 A is present and is chosen from gold, silver, copper, nickel, or some of their mixtures.

_ 5 -

While such compositions are satisfactory, they are quite difficult to manufacture and require Use of less economical metals. In addition, such masses lead to difficulties in regeneration as a result of the tendency of the crystallites to grow together. The applicant has absorption masses for Removal of mercury present in gases or liquids, which has the aforementioned disadvantages resolve and in particular have the advantage that they have a significantly improved absorption capacity for mercury have, are very easy to manufacture and have excellent mechanical resistance to both abrasion as well as against crushing.

The present invention thus relates to absorption masses for removing the in a gas or a liquid existing mercury, characterized in that they consist of sulfur and a binder that is under Alumina, silica, silica-alumina, cements, silicates and calcium sulfates is, the total pore volume of the mass o, 1o cm / g or more, their specific surface between

2
10 and 25o m / g and the amount by weight of sulfur, based on the binder, is between 1 and 90%, preferably between 5 and 60%.

The absorption masses according to the invention preferably have a total pore volume of 0.2o to 0.7o cm / g, their specific

The specific surface area is preferably between 3o and 15o m / g and the proportion by weight of sulfur, based on the binder, is preferably 5 to 60%.

The binder present in the absorption masses according to the invention is selected from: aluminum oxide, silicon dioxide, Silica-alumina, cements, sodium or Potassium silicates and calcium sulfates. The silica-alumina usable according to the invention is preferably one of the clays kaolinite, bentonite, halloisite and attapulgite.

The cements that can be used according to the invention are preferred Natural, Portland, slag, special, Ferrari, pozzolan or alumina cements. In particular, you can use the refractory alumina cements, such as those made by the company

Jr)
Use Lafarge commercialized SECAK * ⁵ * cements.

The average composition of these cements is generally as follows:

Type of binder

2o ^A1 2 ° 3 CaO

Fe ₂ O ₃ FeO SiO ₂

25 MgO K ₂ O Na ₂ O So ₃

3o P ₂ O ₅ Mn ₂ O ₃ ^Cr 2 ° 3 TiO ₂

The aluminum oxide and silicon dioxide present in the absorption masses according to the invention are in the forms

SECAR 15o SECAR 25o SUPER SECAR 25o 5o 7o 8o 27 26th 19th 5 o, 1 o, 1 1 o, 2 - 5 o, 2 o, 1 o, 2 o, 2 o, o5 o, o5 o, o5 - o, o5 o, 5 1, o o, o5 o, o3 o, o5 o, o5 ο, οΤ o, o1 o, 1o O, o5 o, o5 o, o2 o, oo5 o, oo5 o, 1o o, oo2 o, oo3 3 o _f oo3 o, oo3

resulting from drying them at a temperature below 150 ° C and preferably between 80 and 120 ° C.

These shapes can be different depending on the raw material used to make the masses are for aluminum oxide in the encyclopedia by Kirk-Othmer, Vol.2, (1974) or in "ALCOA-Paper Nr.19, (1972)" and for Silica described in "The colloid Chemistry of silica" by Ralph K. Her (1955 and 1979).

If aluminum oxide is present as a binder in the absorption masses according to the invention, then it preferably has fol

3 3

- 0.1 cm / g to 0.15 cm / g of the pore volume consists of

low pore distribution:

3
o, o1 cm / g to ο, 15 ι

Pores with a diameter greater than 1

3
0.15 to 0.65 cm / g of the pore volume consists of I with a diameter above 0.1 M ^m -

The absorption masses according to the invention preferably contain sulfur, the mean particle diameter of which is below 20 and preferably between 0.01 and 10 pm ; surprisingly, the presence of sulfur particles of this size proves to be particularly beneficial for removing mercury from gases or liquids.

In addition, the absorption masses according to the invention can o, 1 up to 15% by weight, based on the total weight of the mass, contain one of the following compounds: starch, polyvinyl alcohol, Methyl cellulose, micropolyethylene, epoxy, Polyester and phenolic resins.

The present invention also relates to the process for the production of these absorbent masses. This method

ti · <t

is characterized by the fact that it contains the following levels:
1. Shaping a mixture of

a) a binder that is under hydrated or rehydratable alumina, silicon dioxide, Cements, silicates and calcium sulphates are selected,

b) Sulfur in the natural state, as a flower, colloidal, in suspension or in solution and c) optionally a porosity aid that either contracts or is volatile at a temperature below 15o C.
15th

2. Drying the obtained mass at a temperature

below 15o ° C, preferably between 8o and 12o C.

Shaping takes place according to the method according to the invention in the usual way, in particular by extrusion, tabletting, in rotating coating devices Merumerization, such as in Belgian patent 84o 77o described, dripping in oil, etc.

According to the process of the invention, the essential function is that which is hydrated or rehydratable Alumina, silica, silica-alumina, the cements, silicates or calcium sulphates in that they serve as binders for the sulfur,

3ο so that after shaping and drying a product is obtained that does not decompose and does not disintegrate on contact with water. If this binder function is not is ensured in a satisfactory manner, but it is also according to a variant of the method according to the invention possible, as a binder, at least partially and preferably in an amount of 0.1 to 15% by weight of polymers,

such as starch, polyvinyl alcohol, methyl cellulose, micropolyethylene or thermosetting resins such as e.g.

Epoxy, polyester and phenolic resins.

The aluminum oxide which can be used according to the invention can be used in In the form of a sol or a peptizable alumina gel. As a peptizing agent, water, or a weak acid such as formic, acetic or propionic acid, or a strong acid such as hydrochloric or Nitric acid. The amount of peptizer should be sufficient to keep the gel in to transform a soft plastic mass. In particular, fine or ultrafine suspensions or dispersions of boehmites or pseudoboehmites are used, which are made up of particles exist, the size of which is in the colloidal range, i.e. below approx. 2ooo S.

As is well known to those skilled in the art, the aqueous suspensions or dispersions of fine or ultrafine Boehmites can be obtained by peptizing these products in water or acidified water. the according to the present invention used fine or ultrafine boehmites can in particular according to the in French patents nos. 1,261,182 and 1,381,282 or in European patent application No. 15,196 Procedures are obtained.

In the process according to the invention, those prepared by the process described below can be used, in particular Use pure aqueous suspensions or dispersions made from boehmite or pseudo boehmite.

- 1ο -

This process creates an alkali aluminate with carbon dioxide with the formation of an amorphous precipitate of aluminum hydroxycarbonate reacted, the resulting precipitate being removed by filtration and then washed (the method is described in particular in American Patent No. 3,268,295). Then it will be

a) in a first stage the washed, amorphous aluminum hydroxycarbonate precipitate with a solution of an acid, a base or a salt or mixtures thereof mixed; this mixing is done by pouring the solution over the hydroxycarbonate, maintaining the pH the resulting mixture is below 11,

b) in a second stage, the reaction mixture obtained in this way is at least 5 minutes to a temperature below 9o ° C heated,

c) in a third stage, the mixture of the second stage,
heats.

Level to a temperature between 9o ° C and 25o ° C

According to this method, the temperature for the treatment is the second stage between 50 and 85 C, with a treatment time of 5 minutes to 5 hours.

According to the method, the acid used in the first stage is a water-soluble strong or weak mineral or organic Acid used, which is preferably selected from nitric, perchloric, sulfuric, hydrochloric, hydroiodic or hydrobromic acid, Ant, vinegar, propionic, butter, oxalic, maleic, amber, glutaric or the chlorine and Bromoacetic acid is chosen.

In this process, the base is used in the first stage a water-soluble weak base used, which is preferably under ammonia, the amines, such as the methylethyl

propylamines the amino alcohols, such as the mono-, Di- or triethanolamines and 2-amino-propanol, the quaternary ammonium hydroxides and the products is selected, which can decompose under the reaction conditions to form a base, such as hexamethylenetetramine or urea.

According to the process, the salt used in the first stage is also selected from the salts of ammonia and the amines and those with an aluminum cation and with nitrate, chloride, formate, acetate or oxalate anions chosen.

In the first stage of the process, the _{concentration of the mixture, calculated as Al 3} O ₃ , of the aluminum compound is from 2o to 400 g / l, and preferably from Ao to 2oo g / l.

According to the method, in the first stage the molar ratio of the sum of the anions and cations present in the mixture (except for H and OH) to the _{equivalent of the aluminum compound, expressed as Al 3} O ₃ , is between o, o1 and 2, preferably between o, o3 and o.9 .

According to the method, the heating temperature in the third stage is between 100 and 160 ° C., the duration being 10 minutes to 30 hours and preferably 30 minutes to 10 hours. The dispersions or suspensions of boehmite and pseudoboehmite obtained according to the process have an alkali content of less than 0.05%, expressed as the alkali oxide / Al _{2 O 3} weight ratio.

As hydrated aluminum oxide, according to the invention, those made from pseudoboehmite, amorphous aluminum oxide gels, Aqueous suspensions or dispersions obtained from aluminum hydroxide gels or ultrafine hydrargillite gels can be used.

The pseudoboehmite can primarily be after the process of American Patent No. 3,630,670 by implementation a solution of an alkali aluminate with a solution of a Mineral acid be made. It can also be made like that in the French patent No. 1 357 830 is described, namely by precipitation at pH 9, a temperature slightly above room temperature such reaction components and with such concentrations that about 50 g of aluminum oxide per liter in the Dispersion receives.

In particular, the amorphous alumina gels can be prepared by the processes described in the publication "Alcoa Paper No. 19 (1972), pages 9-12" are described primarily by the reaction of Aluminate and acid or an aluminum salt and a base or an aluminate and an aluminum salt or 2ο by hydrolysis of aluminum alcoholates or by hydrolysis of basic aluminum salts.

In particular, the aluminum hydroxide gels are those made according to the methods disclosed in U.S. Patents 3,268,295 and 3,245,919 are prepared.

The ultrafine hydrargillite can primarily be produced by the process that is described in French patent 1,371,808, namely by heating an aluminum oxide gel in the form of a cake containing the aluminum oxide 0.10 calculated _{as Al 2} O _{3 molecules} contains monovalent acid ions, to a temperature between room temperature and 60 ⁰ C.

The hydrated Use aluminum oxides of the boehmite type, which are a by-product in the production of alcohol by hydrolysis of an aluminum alcoholate or alkoxide (Ziegler synthesis). The reaction of the synthesis of Ziegler alcohols are particularly described in U.S. Patent 2,892,858. Following this procedure provides Triethylaluminum is first prepared from aluminum, hydrogen and ethylene, the reaction in two stages is carried out with partial recycling of the triethylaluminum.

Al + 3/2 H ₂ + 2 Al (C ₂ H ₅ J ₃ - = * - 3 ₂ g ₂ 3 Al (C ₂ H ₅ J ₂ H + 3 C ₃ H ₄ **. 3 Al (C ₂ H ₅ J ₃

Ethylene is added in the polymerization stage: / ^CH 2 ^CH 3

Al CH ₀ CHo + (x + y + z) C ₀ H.> Al- (CH ₀ CH ₀ ), .H

CH ₀ CH-. ^ (CH ₀ CH ₀ ) H

and then oxidizes the product obtained to aluminum alcoholate.

/ ^R 1

Al R ₂ + 3/2 O ₂ τ 'Al;

R ₃ OR ₃

The alcohols are then obtained by hydrolysis

Al ^ —OR ₀ + (2 + dC) H ₀ O- ^ AlOOH - <CH ₀ O + R ₁ OH + R ₀ OH + R ^ OH OR-,

The paste of aluminum hydroxide obtained can, optionally after drying and CaIcinieruüg, in. The invention Procedures are used.

In particular, the hydrated alumina obtained as a by-product in the Ziegler reaction is all in one Bulletin of the CONOCO dated January 19, 1971.

One can also use the dehydrated and partially dehydrated ones Employ forms of hydrated alumina consisting of the transition aluminas, the in particular at least one of the phases of rho, chi, eta, gamma, kappa, theta, delta, preferably with exception Contained by alpha alumina.

The aluminum oxide that is produced in the process according to the invention can use, can be in the form of aluminum oxide, which is a predominant proportion of rehydratable Contains aluminum oxide. Such an aluminum oxide has a poorly crystallized and / or amorphous structure and can be produced, for example, according to the process described in French patent 1,438,497 (This Alumina is sometimes commonly referred to as "flash alumina" designated). .

For the purposes of this process, the poorly crystallized aluminum oxide is understood to be one in which the 3ο X-ray analysis gives a diagram that only shows one or a few unclear lines corresponding to the crystalline transition phase of the alumina at low temperature shows and in particular contains the phases Chi, Rho, Eta, Gamma, Pseudogamma and their mixtures.

332409 Ί

Under aluminum oxide of amorphous structure one understands an aluminum oxide whose X-ray analysis does not shows characteristic line of any crystalline phase.

The active rehydratable aluminum oxide used is generally obtained by rapid dehydration of aluminum

-Jonium hydroxides such as Bayer it, hydrargillite or gibbsite, north strandite or the oxyhydroxides of aluminum such as boehmite and diaspore obtained. This dehydration can be carried out in any suitable device with the aid of a hot gas stream. The entry temperature of the gases into the device generally fluctuates between 400 and 1200 ^° C. and the contact time between the hydroxide or oxyhydroxide and the hot gases is generally a fraction of a second up to 4 to 5 seconds.

° i ^e by the BET method specific surface area measured of the obtained by rapid dehydration of hydroxides and oxyhydroxides active, re-hydratable alumina generally varies between 40 and 400 m ² / g, the particle diameter generally ranges between 0.1 and 300 μΐη and preferably between 1 and 120 microns. The measured at a calcination at 1000 ⁰ C ignition loss generally varies between 3 and 15%, corresponding to a molar ratio H ₂ CVAL ₂ O ₃ corresponds to between about 0.17 and 0.85.

According to a special procedure, an active aluminum oxide is preferably used, which is obtained from rapid drainage comes from Bayer hydrate (hydrargillite) and is an industrially easily accessible and very inexpensive aluminum hydroxide is. Such active alumina is well known to those skilled in the art. The method of its manufacture is described in particular in French patent 1 108 011.

The silicon dioxide which can be used according to the method of the invention is any silicon dioxide which has the desired binder properties, and in particular a
Trading is.

special one like the one under the brand Ludox im

The silica-alumina and the cements that one can use according to the method according to the invention are ^ ° those described above.

The sulfur used in the invention is in the natural state, as a flower, a suspension, a solution in a colloidal state or dissolved in an organic solu- ¹ ^ solvents such as toluene, before. The particle size of the sulfur should be such that the mean particle diameter is less than 20 μια and preferably. wise 0.1 to 10 μπί.

The volatile at a temperature below 150 ⁰ C Porositätshilfsmittel are selected the gum and microcrystalline cellulose under naphthalene, ammonium carbonate, ammonium hydrogen carbonate, methylcellulose, Sthy! Cellulose, carboxymethyl cellulose, sugars. These accessories have that

² ^ purpose to create a macroporosity, ie pores whose diameter is greater than or equal to 0.1 μπι. They must be removed by heating to a temperature below 15O ⁰ C.

The porosity aids which shrink at a temperature below 150 ^° C. are chosen from among textile fibers, glass fibers, asbestos fibers and aluminum oxide fibers.

These additives also have the function of creating a macroporosity, and at the same time improving the mediate niche resistance of the absorbent masses unfolding them.

In the method according to the invention, the mixture can be added in an amount of 0.1 to 15% based on the total weight of the mixture, a compound can be added, which among starch, polyvinyl alcohol, methyl cellulose, Microethylene, epoxy resins, polyester and phenolic resins is selected. As described above, these connections have the function of improving the mechanical strength of the masses when these are replaced by the aluminum oxide, the silica, silica-alumina or cements are not satisfactorily ensured is.

The mixture of sulfur and binder is adjusted in the mass obtained so that the weight ratio of sulfur to binder between 1 and 90% and preferably is between 5 and 60%.

The shaping of the mixture of binder, sulfur and possibly pore formers is done with the classic Methods mentioned above: extrusion, tabletting, rotating coating devices, merumerization, Dripping in oil.

The shaping is preferably carried out by extrusion. In particular, the extrusion can be carried out in the presence of various anionic, cationic or nonionic surface-active agents, provided that they do not leave any harmful residue in the compositions when they are subsequently used. Suitable surface-active agents are the C ₃ -C ₁₂ alcohols, the polyethers of primary straight-chain alcohols, the dimethylsilicones, the silicone-polyether copolymers

and various polymeric compounds of the polyoxyethylated type Alkylphenols, fatty acid esters, alcohols, mercaptans, alkylamines, and alkylamides include. As a surface active The polyether of a primary straight-chain alcohol sold under the trademark Antarox BL-240 is on the market. The surfactant is preferably used in an amount of 0.1 to 10 percent by weight, based on the mixture used.

The shaping of the hydrated alumina according to the invention Composition containing by extrusion can be carried out under the conditions known to the person skilled in the art in particular among those described in Belgian patents nos. 830 652 and 840 770, French Patents 2,265,452, 2,307,576, 2,364,063, 2,374,956,

2,397,683 and in British Patent No. 1,094,360.

In the compositions of the invention that are hydratable Contain aluminum oxide, the extrusion can under the conditions and well known to the person skilled in the art in particular those described in French patents 2,351,071, 2,354,815, 2,397,375, 2,398,540 and 2,413,323 and in the American patent

3 404 111 are described.

The absorption masses according to the invention are distinguished due to a significantly improved stability, an excellent mechanical resistance to both Abrasion as well as crushing and good behavior against water because they do not disintegrate in contact with it or dissolve. The compositions according to the invention also have a significantly improved absorption capacity for mercury, which is generally above 15% and 200%, expressed in terms of the weight of the absorbed Mercury, based on the starting mixture, can reach.

The temperature range in which the compositions can be used is generally between -50 and 150 ^° C. The 5 optimal temperatures depend on the gas to be treated and its composition, in order to prevent excessive condensation of water or other condensable substances .

Iq This inclusion can be at atmospheric pressure or less or higher pressure. The total pressure can reach 200 bar, for example.

The VoVoH ₀ (filling volume at normal temperature and normal pressure per volume of the absorption mass and hour) can vary, for example, between 50 and 50,000, but it is preferable to work at a VVH value between 200 and 20,000, depending on the pressure applied, the mercury content of the gas to be treated and the desired degree of purification.

The treated gases can contain, for example, from 10 nanograms to 10 grams or more of mercury per m ³ .

The means for removal of mercury can consist of one single reactor or of at least two reactors connected in parallel, but preferably be at least zifrei reactors connected in series is used.

The effectiveness of the masses in capturing the mercury 3o

is tested with two devices, one of which works at normal pressure and the other at 30 bar.

The device consists of a metal tube whose ineffectiveness for the fixation of mercury is controlled and that contains at least 30 ml of the absorbent mass to be tested and through which one can regulate Gas volume leads.

The mercury content is determined using a COLEMAN mercury analyzer based on the method by HATCH and OTT, which is described in Analytical Chemistry, December 1968.

The liquid phase study was carried out at room temperature with pentane, which is 4 micrograms of mercury per liter and was injected with the aid of a metering pump.

The following examples are intended to illustrate the invention and in no way limit the scope of those described herein Way of working.

example

A - Making the masses
Mass A -

80 kg of a powder of hydrated alumina gel of the boehmite type are carefully kneaded with 20 kg of micronized sulfur.

The aluminum oxide gel was obtained as a by-product in the production of alcohols by hydrolysis of an aluminum alcoholate or alkoxide, its specific surface is 150 iti ² / g, the water content is 22% by weight and the particle size is below 20 μm.

50 percent by weight of the micronized sulfur used have a particle size of less than 9 μm and there are no sulfur particles with a diameter of more than 24 μm.

When working through, 44 l of water, 1.2 l of 12N hydrochloric acid and 5.2 kg of naphthalene are added.

The paste thus obtained then becomes cylinders of

3mm diameter and 4mm length extruded. After drying in a drying oven at 80 ^° C. for 8 hours and then 3 hours at 120 ^° C., the particles have a specific surface area of 50 m ² / g, a compressive strength of 1 kg / mm ² and a total pore volume of 0, 28 cm ³ / g, of which 0.09 cm ³ / g porosity about 1 micron. Ίο The sulfur content of the mass is 22%.

Mass B -

Mixing thoroughly 80 kg of an active rehydratable alumina powder obtained by rapid dehydration of bayerite at a temperature of 800 ⁰ C, with an aqueous suspension of colloidal sulfur and 60 percent by weight sulfur and 300 g of methyl cellulose.

The alumina has an average particle size of

4 microns and a specific surface area of 300 m ² / g. 2o

50% of the used colloidal sulfur has a particle size below 4 μm and there are no sulfur particles a diameter over 15 μm.

The mixture is then coated. During the coating, the powder is moistened by spraying on 27 liters of water containing 2.7 kg of Na ₃ O in the form of NaOH.

The obtained spheres 2.4 to 4 mm is left to 24 hours at 20 to 3O ⁰ C and then they are mature for 8 hours at 8O ⁰ C and for 3 hours at 12O ⁰ C dried.

The specific surface area of the spheres obtained is 145 m ² / g. The fragmentation from grain to grain is 7 kg and the total pore volume is 0.24 cm ³ / g, of which 0.04 cm ^{3 has} a porosity greater than 1 micron. The sulfur content of mass B is 21%.

Mass C -

80 kg of the cement produced by the Compagnie Lafarge of the Secar 250 type are carefully mixed with 20 kg of colloidal sulfur identical to that used for the preparation of the mass B was used. The mixture was then poured through in a coating machine Spray coated with water.

The 2.4 to 4 mm spheres obtained are then ^{aged at 20 to 30 ° C. for 24 hours, then dried at 80 °} C. for 8 hours and at 120 ^° C. for 3 hours. The spheres thus obtained have a specific surface area of 60 m ² / g, a breaking strength over 8 kg and a total pore volume of 0.21 cm ³ / g, of which 3 cm ³ / g have a porosity over 1 micron. The sulfur content of the mass is 20%.

B attempts

The effectiveness of the masses produced was tested,

by passing a mercury-containing natural gas over 20 cm ^{3 of} the absorption mass, which is contained in a jacketed metal tube 2 cm in diameter, the ineffectiveness of which has been checked for the binding of mercury. 25th

The natural gas used has a composition in percent by volume of 84% methane and 0.3% hydrocarbons with 5 carbon atoms or more.

The initial effectiveness of the masses was determined at room temperature and various WH with a natural gas that had a mercury content of 10 mg / m ³ for the tests at atmospheric pressure and 1 mg / m ³ for the tests at 30 bar. The effectiveness is defined by 5 the ratio:

Hg content at entry -Hg content at exit _x - | 00 Hg content at entry

: Γ ": -: 1 ι" ·: ":.": 3 3 2 4 0 £ '1

- 23 -

The results obtained are shown in the table below.

Dimensions WH pressure Degree of purification A. 100 1 99.9 1000 1 99.5 2000 1 95.2 B. 500 1 99.9 1000 1 99.9 2000 1 99.4 C. 500 1 99.9 1000 1 99.7 2000 1 99.1

Tests at a pressure of 30 bar:

Mass VYH pressure degree of purification

A. 10,000 30th 99.9 15000 30th 99.5 B. 10,000 30th 99.9 15000 30th 99.9 C. 10,000 30th 99.9 15000 30th 99.7

° In order to compare the absorption capacity of these masses, a VVH 5000 corresponding gas volume is added 30 bar above these masses and the amount of mercury absorbed is limited to 8% of the total weight of the masses.

- 24 -

An activity test was then carried out to determine the effectiveness of the compositions under the same conditions to check out for the trial; rftit, a print of 30 bar were defined.

Dimensions
A.

WH pressure Degree of purification 10,000 30th 99.7 15000 30th 99.1 10,000 30th 99.9 15000 30th 99.6 10,000 30th 99.8 15000 30th 99.5

Claims (11)

JO / .4UO I claims 1. Absorption masses for removing the in a gas or a liquid present mercury, characterized in that it consists of sulfur and consist of a binder, which is composed of aluminum oxide, silicon dioxide, silicon dioxide-aluminum oxide, cements, Silicates and calcium sulfates is chosen so that the total pore volume of the mass is greater than or equal to 3
0.1 cm / g, the specific surface area 1o to 2
Is 25o m / g and the weight ratio of sulfur to binder is between 1 and 90%. 2. Absorbent masses according to claim 1, characterized in that draws that their total pore volume between 3 2 o.2o cm / g and o.7o m / g is that the specific The surface area is 3o to 15o m / g and the weight ratio of sulfur to binder is between 5 and 6o%.
2o 3. Absorbent masses according to claim 1 or 2, characterized characterized in that the mean diameter of the pm Sulfur particles below 2o and preferably is between o, 1 and 1o. 25th 4. Absorbent masses according to any one of claims to 3, characterized in that the binder is aluminum oxide and that the pore distribution of the masses is such that
- 0.1 cm / g to 0.15 cm / g from pores with a diameter knife over 1 and - 0.15 to 0.65 cm / g of the pore volume of pores of a Diameter over 0.1. pm 4 · ·
OW W 2 - 5. Absorbent masses according to any one of claims 1 to 3, characterized in that the cements under Natural cement, Portland cement, slag cements, special cements, Ferrari cements, pozzolana cements and calcium aluminate cements are selected. 6. A process for the manufacture of absorbent masses according to any one of the preceding claims, characterized in that characterized in that it contains the following stages: 1. Shaping a mixture of a) a binder under hydrated or rehydratable alumina, Silicon dioxide, the silicon dioxide-aluminum oxides, cements, silicates and calcium sulphates are selected, b) sulfur in its natural state, as a flower, colloidal, in suspension or in solution, c) and optionally a porosity aid, which at a temperature below 15o ° either shrinks or is volatile. 2. Drying of the mass obtained at a temperature below 150 ° and preferably between 8o and 12o ° C. 7. A method for producing the absorption masses according to claim 6, characterized in that the shaping by extrusion, tabletting, molding in a rotating coating device, merumerisation or Dripping into oil takes place. 8. The method according to claim 6 or 7, characterized in that the particle diameter of the sulfur below 2o and preferably between o, o1 and pm 1o lies. 9. The method according to claim 6, characterized in that the mixture additionally contains in a weight ratio to the total weight of the mixture of 0.1 to 15%, starch, polyvinyl alcohol, methyl cellulose, micropolyethylene, epoxy resins, polyester resins, or phenolic resins. 1o. Method according to claim 6, characterized in that that the porosity aid is one of the following Substances selected: naphthalene, ammonium carbonate, ammonium hydrogen carbonate, methyl cellulose, Ethyl cellulose, carboxymethyl cellulose, sugars, gums, microcrystalline cellulose, textile fibers, Glass fibers, asbestos fibers, alumina fibers. 11. Method of removing the in a gas or a Liquid present mercury, characterized in that one is the gas or the liquid with an absorbent composition according to any one of claims 1 to 5.